Data problems continue to account for most of the network issues experienced, says J.D. Power.

“The tasks performed by heavy users can represent a significant strain on carrier networks,” said Adrian Chung, director at J.D. Power, in a statement to iPhone in Canada.

“Plus, the frequent consumption of services by this group means more recent and top-of-mind experiences. Carriers can expect to elevate the customer experience at all user levels if they focus on the needs of their heaviest users, who are most sensitive to problems, while simultaneously enhancing the device experience,” added Chung.

The study also concluded younger users between the ages of 18-34 experienced more network problems, while texting again dominated voice usage, taking 56% of connections amongst heavy wireless users.

The study showed heavy users saw average monthly bills of $104 (35% of these had a 5GB data plan or higher), versus $93 among medium users and $76 among light users.

In the East region, Quebec’s Videotron ranked the highest in network quality. Rogers and Bell were below the East region average with 12 PP100.

In Ontario, Telus was ranked first in overall network quality (9 PP100) and in the West region (9 PP100). Freedom Mobile fared the worst in Ontario with 18 PP100.

Check out the charts below:

The J.D. Power study is based on 15,021 responses and was fielded in September-October 2016 and March 2017.